Home
Verification Problems
This manual presents solved verification models including NAFEMS problems.
NAFEMS Nonlinear Static Analysis
OS-V: 0240 3D Steel Roller on Rubber
Contacts Benchmark 5For quasi-static analysis using linear elastic material, geometric non-linearity and nonlinear boundary conditions.

Welcome
What's New
View new features for OptiStruct 2024.1.
Overview
OptiStruct is a proven, modern structural solver with comprehensive, accurate and scalable solutions for linear and nonlinear analyses across statics and dynamics, vibrations, acoustics, fatigue, heat transfer, and multiphysics disciplines.
Tutorials
Discover OptiStruct functionality with interactive tutorials.
User Guide
This manual provides detailed information regarding the features, functionality, and simulation methods available in OptiStruct.
Reference Guide
This manual provides a detailed list and usage information regarding input entries, output entries, and parameters available in OptiStruct.
Example Guide
The OptiStruct Example Guide is a collection of solved examples for various solution sequences and optimization types and provides you with examples of the real-world applications and capabilities of OptiStruct.
Verification Problems
This manual presents solved verification models including NAFEMS problems.
- NAFEMS Linear Elastic
- NAFEMS Thermo-elastic
- NAFEMS Heat Transfer
- NAFEMS Nonlinear Static Analysis
  - OS-V: 0220 3D Punch (Rounded Edges)
    Contacts Benchmark 2 For quasi-static analysis using linear elastic material, geometric non-linearity and nonlinear boundary conditions.
  - OS-V: 0230 3D Loaded Pin
    Contacts Benchmark 4 For Quasi-static analysis using Linear elastic material, geometric non-linearity and nonlinear boundary conditions. OptiStruct FE results examine the plot of contact pressure, tangential stress and relative tangential slip against angle $θ$ .
  - OS-V: 0240 3D Steel Roller on Rubber
    Contacts Benchmark 5For quasi-static analysis using linear elastic material, geometric non-linearity and nonlinear boundary conditions.
  - OS-V: 0250 3D Sheet Metal Forming
    Contacts Benchmark 3 For quasi-static analysis using elastic plastic material, geometric non-linearity and nonlinear boundary conditions.
  - OS-V: 0260 Shell Bending under a Tip Load
    A beam is analyzed for bending due to tip load. OptiStruct investigates the vertical steady-state displacement at the tip of the beam.
  - OS-V: 0270 Torsional Creep of Circular Shaft
    This benchmark illustrates the structural response of a power law creeping material in a geometrical configuration subjected to pure torsion. OptiStruct examines strain at the edge of the shaft.
  - OS-V: 0280 Axisymmetric Elements - Interference Fit Between Two Cylinders
    The model examines the contact pressure between two cylinders in case of interference fit of 20 mm.
  - OS-V: 0290 Lee's Frame Postbuckling
    Examines the postbuckling behavior of an L-shaped frame (Lee’s frame) loaded by a vertical point load.
  - OS-V: 0291 Hertzian Contact - Elastic Sphere and Rigid Half-space
    Hertzian contact is demonstrated using OptiStruct for an elastic sphere and rigid half-space problem.
  - OS-V: 0292 Hertzian Contact - Rigid Sphere and Elastic Half Space, 2D Axisymmetric, S2S Contact
    Hertzian contact is demonstrated using OptiStruct for rigid sphere and elastic half-space –2D axisymmetric, S2S CONTACT.
  - OS-V: 0293 Hertzian Contact - Rigid Sphere and Elastic Half Space, S2S Contact with Smoothing
    Hertzian contact is demonstrated using OptiStruct for rigid sphere & elastic half space – S2S CONTACT with Smoothing.
- NAFEMS Dynamic Response Analysis
- NAFEMS Random Response Analysis
- NAFEMS Normal Modes Analysis
- NAFEMS Composites
- Response Spectrum Analysis
- Elements
- Materials
- Fatigue Analysis
- Rotor Dynamics
- Frequency Response Analysis
- Explicit Dynamic Analysis
- Aeroelastic Analysis
Frequently Asked Questions
This section provides quick responses to typical and frequently asked questions regarding OptiStruct.

View All Altair HyperWorks Help

OS-V: 0240 3D Steel Roller on Rubber

Contacts Benchmark 5For quasi-static analysis using linear elastic material, geometric non-linearity and nonlinear boundary conditions.

OptiStruct FE results examine the horizontal displacement of the point A after 360 degrees’ motion. OptiStruct also examines the 3D deformable-deformable contact, rolling contact and Incompressible material feature.

Figure 1. FE Model with Boundary Conditions and Loadcases

Model Files

Before you begin, copy the file(s) used in this problem to your working directory.

contb5H8.fem

Benchmark Model

Hexa8 elements are used to create one half of the model. The steel is of 20 mm width and 30 mm radius, the rubber mat is 22 mm wide, 20 mm in high and 360 mm long. The steel roller starts rolling from a point 60mm from the left-hand side of the rubber mat. The center of the roller is fixed in horizontal and vertical direction, for a time period of 0-1 second the bottom surface of the rubber is displaced 3mm in the negative y direction, the sheet x-displacement is fixed and there is no roller rotation. For the time period of 1-2 second the bottom surface of the rubber sheet is held at 3 mm y-displacement and rotation of 360 degrees is prescribed to the steel roller where the sheet is free to move in horizontal direction. There is no force applied on the system and the coefficient of friction between the two surface is 0.3. The nodes on the outer surface of the roll are selected as main nodes, while the nodes on the top surface of the mat are specified as the secondary nodes.

The material properties are:

Material Properties: Value
E_steel: 210 kN/mm²
N_steel: 0.3
C_{10, rubber}: 10 N/mm² (Neo Hookean material description)
D1_rubber: 0.0001

Nonlinear Static Analysis Results


Horizontal Displacement (mm)	NAFEMS	OptiStruct	Normalized
3D first order elements	182.9	182.06	1.00461386

Figure 2. Vertical Forces on the Roller versus Time

Figure 3. 3D Analysis – Undeformed and Contour Plots of Contact Pressure on Deformed Structure

Reference

NAFEMS R0094 - Advanced finite element contact benchmarks, Konter 2006